Fasting for 16-20 hours a day is very good for you too. It makes it much easier if you don't eat sugar and carbs. Those things make your body release hormones that make you feel hungry all the time. Humans are designed to be able to fast as are most animals. Most just aren't able to do it anymore because of a shitty carby unnatural diet. The longest medical fast recorded is 382 days. I regularly fast 23 hours and sometimes 48